THIN FILM TRANSISTOR AND MANUFACTURING METHOD THEREOF, ARRAY SUBSTRATE AND LIQUID CRYSTAL DISPLAY DEVICE

摘要

A thin film transistor and manufacturing method thereof, array substrate and liquid crystal display device comprising the thin film transistor, the thin film transistor comprising a gate electrode and a source electrode (9); the gate electrode comprises a first metal layer block (2) and a second metal layer block (3) located above the first metal layer block (2); the thermal expansion coefficient of the second metal layer block (3) is smaller than that of the first metal layer block (2); the upper surface of the first metal layer block (2) is in contact with the lower surface of the second metal layer block (3); and the width of the upper surface of the first metal layer block (2) is consistent with that of the lower surface of the second metal layer block (3). The thin film transistor can inhibit the generation of a hillock while effectively avoiding electricity leakage.